includes/SpecialSearch.php

   1 <?php
   2 # Copyright (C) 2004 Brion Vibber <brion@pobox.com>
   3 # http://www.mediawiki.org/
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along
  16 # with this program; if not, write to the Free Software Foundation, Inc.,
  17 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Run text & title search and display the output
  22  * @package MediaWiki
  23  * @subpackage SpecialPage
  24  */
  25
  26 require_once( 'SearchEngine.php' );
  27 require_once( 'Revision.php' );
  28
  29 function wfSpecialSearch( $par='' ) {
  30         global $wgRequest, $wgUser;
  31
  32         $search = $wgRequest->getText( 'search', $par );
  33         $searchPage = new SpecialSearch( $wgRequest, $wgUser );
  34         if( $wgRequest->getVal( 'fulltext' ) ||
  35                 !is_null( $wgRequest->getVal( 'offset' ) ) ||
  36                 !is_null ($wgRequest->getVal( 'searchx' ) ) ) {
  37                 $searchPage->showResults( $search );
  38         } else {
  39                 $searchPage->goResult( $search );
  40         }
  41 }
  42
  43
  44 class SpecialSearch {
  45         /**
  46          * Set up basic search parameters from the request and user settings.
  47          * Typically you'll pass $wgRequest and $wgUser.
  48          *
  49          * @param WebRequest $request
  50          * @param User $user
  51          * @access public
  52          */
  53         function SpecialSearch( &$request, &$user ) {
  54                 list( $this->limit, $this->offset ) = $request->getLimitOffset( 20, 'searchlimit' );
  55
  56                 if( $request->getCheck( 'searchx' ) ) {
  57                         $this->namespaces = $this->powerSearch( $request );
  58                 } else {
  59                         $this->namespaces = $this->userNamespaces( $user );
  60                 }
  61
  62                 $this->searchRedirects = false;
  63         }
  64
  65         /**
  66          * If an exact title match can be found, jump straight ahead to
  67          * @param string $term
  68          * @access public
  69          */
  70         function goResult( $term ) {
  71                 global $wgOut;
  72                 global $wgGoToEdit;
  73
  74                 $this->setupPage( $term );
  75
  76                 # Try to go to page as entered.
  77                 #
  78                 $t = Title::newFromText( $term );
  79
  80                 # If the string cannot be used to create a title
  81                 if( is_null( $t ) ){
  82                         return $this->showResults( $term );
  83                 }
  84
  85                 # If there's an exact or very near match, jump right there.
  86                 $t = SearchEngine::getNearMatch( $term );
  87                 if( !is_null( $t ) ) {
  88                         $wgOut->redirect( $t->getFullURL() );
  89                         return;
  90                 }
  91
  92                 # No match, generate an edit URL
  93                 $t = Title::newFromText( $term );
  94                 if( is_null( $t ) ) {
  95                         $editurl = ''; # hrm...
  96                 } else {
  97                         # If the feature is enabled, go straight to the edit page
  98                         if ( $wgGoToEdit ) {
  99                                 $wgOut->redirect( $t->getFullURL( 'action=edit' ) );
 100                                 return;
 101                         } else {
 102                                 $editurl = $t->escapeLocalURL( 'action=edit' );
 103                         }
 104                 }
 105                 # FIXME: HTML in wiki message
 106                 $wgOut->addHTML( '<p>' . wfMsg('nogomatch', $editurl, htmlspecialchars( $term ) ) . "</p>\n" );
 107
 108                 return $this->showResults( $term );
 109         }
 110
 111         /**
 112          * @param string $term
 113          * @access public
 114          */
 115         function showResults( $term ) {
 116                 $fname = 'SpecialSearch::showResults';
 117                 wfProfileIn( $fname );
 118
 119                 $this->setupPage( $term );
 120
 121                 global $wgUser, $wgOut;
 122                 $sk = $wgUser->getSkin();
 123                 $wgOut->addWikiText( wfMsg( 'searchresulttext' ) );
 124
 125                 #if ( !$this->parseQuery() ) {
 126                 if( '' === trim( $term ) ) {
 127                         $wgOut->addWikiText(
 128                                 '==' . wfMsg( 'badquery' ) . "==\n" .
 129                                 wfMsg( 'badquerytext' ) );
 130                         wfProfileOut( $fname );
 131                         return;
 132                 }
 133
 134                 global $wgDisableTextSearch;
 135                 if ( $wgDisableTextSearch ) {
 136                         global $wgInputEncoding;
 137                         $wgOut->addHTML( wfMsg( 'searchdisabled' ) );
 138                         $wgOut->addHTML( wfMsg( 'googlesearch',
 139                                 htmlspecialchars( $term ),
 140                                 htmlspecialchars( $wgInputEncoding ) ) );
 141                         wfProfileOut( $fname );
 142                         return;
 143                 }
 144
 145                 $search =& SearchEngine::create();
 146                 $search->setLimitOffset( $this->limit, $this->offset );
 147                 $search->setNamespaces( $this->namespaces );
 148                 $titleMatches = $search->searchTitle( $term );
 149                 $textMatches = $search->searchText( $term );
 150
 151                 $num = $titleMatches->numRows() + $textMatches->numRows();
 152                 if ( $num >= $this->limit ) {
 153                         $top = wfShowingResults( $this->offset, $this->limit );
 154                 } else {
 155                         $top = wfShowingResultsNum( $this->offset, $this->limit, $num );
 156                 }
 157                 $wgOut->addHTML( "<p>{$top}</p>\n" );
 158
 159                 if( $num || $this->offset ) {
 160                         $prevnext = wfViewPrevNext( $this->offset, $this->limit,
 161                                 'Special:Search',
 162                                 wfArrayToCGI(
 163                                         $this->powerSearchOptions(),
 164                                         array( 'search' => $term ) ) );
 165                         $wgOut->addHTML( "<br />{$prevnext}\n" );
 166                 }
 167
 168                 global $wgContLang;
 169                 $tm = $wgContLang->convertForSearchResult( $search->termMatches() );
 170                 $terms = implode( '|', $tm );
 171
 172                 if( $titleMatches->numRows() ) {
 173                         $wgOut->addWikiText( '==' . wfMsg( 'titlematches' ) . "==\n" );
 174                         $wgOut->addHTML( $this->showMatches( $titleMatches, $terms ) );
 175                 } else {
 176                         $wgOut->addWikiText( '==' . wfMsg( 'notitlematches' ) . "==\n" );
 177                 }
 178
 179                 if( $textMatches->numRows() ) {
 180                         $wgOut->addWikiText( '==' . wfMsg( 'textmatches' ) . "==\n" );
 181                         $wgOut->addHTML( $this->showMatches( $textMatches, $terms ) );
 182                 } elseif( $num == 0 ) {
 183                         # Don't show the 'no text matches' if we received title matches
 184                         $wgOut->addWikiText( '==' . wfMsg( 'notextmatches' ) . "==\n" );
 185                 }
 186
 187                 if ( $num == 0 ) {
 188                         $wgOut->addWikiText( wfMsg( 'nonefound' ) );
 189                 }
 190                 if( $num || $this->offset ) {
 191                         $wgOut->addHTML( "<p>{$prevnext}</p>\n" );
 192                 }
 193                 $wgOut->addHTML( $this->powerSearchBox( $term ) );
 194                 wfProfileOut( $fname );
 195         }
 196
 197         #------------------------------------------------------------------
 198         # Private methods below this line
 199
 200         /**
 201          *
 202          */
 203         function setupPage( $term ) {
 204                 global $wgOut;
 205                 $wgOut->setPageTitle( wfMsg( 'searchresults' ) );
 206                 $wgOut->setSubtitle( wfMsg( 'searchquery', htmlspecialchars( $term ) ) );
 207                 $wgOut->setArticleRelated( false );
 208                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 209         }
 210
 211         /**
 212          * Extract default namespaces to search from the given user's
 213          * settings, returning a list of index numbers.
 214          *
 215          * @param User $user
 216          * @return array
 217          * @access private
 218          */
 219         function userNamespaces( &$user ) {
 220                 $arr = array();
 221                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 222                         if( $user->getOption( 'searchNs' . $ns ) ) {
 223                                 $arr[] = $ns;
 224                         }
 225                 }
 226                 return $arr;
 227         }
 228
 229         /**
 230          * Extract "power search" namespace settings from the request object,
 231          * returning a list of index numbers to search.
 232          *
 233          * @param WebRequest $request
 234          * @return array
 235          * @access private
 236          */
 237         function powerSearch( &$request ) {
 238                 $arr = array();
 239                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 240                         if( $request->getCheck( 'ns' . $ns ) ) {
 241                                 $arr[] = $ns;
 242                         }
 243                 }
 244                 return $arr;
 245         }
 246
 247         /**
 248          * Reconstruct the 'power search' options for links
 249          * @return array
 250          * @access private
 251          */
 252         function powerSearchOptions() {
 253                 $opt = array();
 254                 foreach( $this->namespaces as $n ) {
 255                         $opt['ns' . $n] = 1;
 256                 }
 257                 $opt['redirs'] = $this->searchRedirects ? 1 : 0;
 258                 $opt['searchx'] = 1;
 259                 return $opt;
 260         }
 261
 262         /**
 263          * @param ResultWrapper $matches
 264          * @param string $terms partial regexp for highlighting terms
 265          */
 266         function showMatches( &$matches, $terms ) {
 267                 $fname = 'SpecialSearch::showMatches';
 268                 wfProfileIn( $fname );
 269
 270                 global $wgOut;
 271                 $off = $this->offset + 1;
 272                 $out = "<ol start='{$off}'>\n";
 273
 274                 while( $row = $matches->fetchObject() ) {
 275                         $out .= $this->showHit( $row, $terms );
 276                 }
 277                 $out .= "</ol>\n";
 278
 279                 // convert the whole thing to desired language variant
 280                 global $wgContLang;
 281                 $out = $wgContLang->convert( $out );
 282                 wfProfileOut( $fname );
 283                 return $out;
 284         }
 285
 286         /**
 287          * Format a single hit result
 288          * @param object $row
 289          * @param string $terms partial regexp for highlighting terms
 290          */
 291         function showHit( $row, $terms ) {
 292                 $fname = 'SpecialSearch::showHit';
 293                 wfProfileIn( $fname );
 294                 global $wgUser, $wgContLang;
 295
 296                 $t = Title::makeTitle( $row->page_namespace, $row->page_title );
 297                 if( is_null( $t ) ) {
 298                         wfProfileOut( $fname );
 299                         return "<!-- Broken link in search result -->\n";
 300                 }
 301                 $sk =& $wgUser->getSkin();
 302
 303                 $contextlines = $wgUser->getOption( 'contextlines' );
 304                 if ( '' == $contextlines ) { $contextlines = 5; }
 305                 $contextchars = $wgUser->getOption( 'contextchars' );
 306                 if ( '' == $contextchars ) { $contextchars = 50; }
 307
 308                 $link = $sk->makeKnownLinkObj( $t, '' );
 309                 $text = Revision::getRevisionText( $row );
 310                 $size = wfMsg( 'nbytes', strlen( $text ) );
 311
 312                 $lines = explode( "\n", $text );
 313
 314                 $max = IntVal( $contextchars ) + 1;
 315                 $pat1 = "/(.*)($terms)(.{0,$max})/i";
 316
 317                 $lineno = 0;
 318
 319                 $extract = '';
 320                 wfProfileIn( "$fname-extract" );
 321                 foreach ( $lines as $line ) {
 322                         if ( 0 == $contextlines ) {
 323                                 break;
 324                         }
 325                         ++$lineno;
 326                         if ( ! preg_match( $pat1, $line, $m ) ) {
 327                                 continue;
 328                         }
 329                         --$contextlines;
 330                         $pre = $wgContLang->truncate( $m[1], -$contextchars, '...' );
 331
 332                         if ( count( $m ) < 3 ) {
 333                                 $post = '';
 334                         } else {
 335                                 $post = $wgContLang->truncate( $m[3], $contextchars, '...' );
 336                         }
 337
 338                         $found = $m[2];
 339
 340                         $line = htmlspecialchars( $pre . $found . $post );
 341                         $pat2 = '/(' . $terms . ")/i";
 342                         $line = preg_replace( $pat2,
 343                           "<span class='searchmatch'>\\1</span>", $line );
 344
 345                         $extract .= "<br /><small>{$lineno}: {$line}</small>\n";
 346                 }
 347                 wfProfileOut( "$fname-extract" );
 348                 wfProfileOut( $fname );
 349                 return "<li>{$link} ({$size}){$extract}</li>\n";
 350         }
 351
 352         function powerSearchBox( $term ) {
 353                 $namespaces = '';
 354                 foreach( SearchEngine::searchableNamespaces() as $ns => $name ) {
 355                         $checked = in_array( $ns, $this->namespaces )
 356                                 ? ' checked="checked"'
 357                                 : '';
 358                         $name = str_replace( '_', ' ', $name );
 359                         if( '' == $name ) {
 360                                 $name = wfMsg( 'blanknamespace' );
 361                         }
 362                         $namespaces .= " <label><input type='checkbox' value=\"1\" name=\"" .
 363                           "ns{$ns}\"{$checked} />{$name}</label>\n";
 364                 }
 365
 366                 $checked = $this->searchRedirects
 367                         ? ' checked="checked"'
 368                         : '';
 369                 $redirect = "<input type='checkbox' value='1' name=\"redirs\"{$checked} />\n";
 370
 371                 $searchField = "<input type='text' name=\"search\" value=\"" .
 372                         htmlspecialchars( $term ) ."\" width=\"80\" />\n";
 373
 374                 $searchButton = '<input type="submit" name="searchx" value="' .
 375                   htmlspecialchars( wfMsg('powersearch') ) . "\" />\n";
 376
 377                 $ret = wfMsg( 'powersearchtext',
 378                         $namespaces, $redirect, $searchField,
 379                         '', '', '', '', '', # Dummy placeholders
 380                         $searchButton );
 381
 382                 $title = Title::makeTitle( NS_SPECIAL, 'Search' );
 383                 $action = $title->escapeLocalURL();
 384                 return "<br /><br />\n<form id=\"powersearch\" method=\"get\" " .
 385                   "action=\"$action\">\n{$ret}\n</form>\n";
 386         }
 387 }
 388
 389 ?>